Clojure speed ÷ Java 7 speed | Computer Language Benchmarks Game

1 : Are the Clojure programs faster? At a glance.

Each chart bar shows, for one unidentified benchmark, how much the fastest Clojure program used compared to the fastest Java 7 program.

These are not the only compilers and interpreters. These are not the only programs that could be written. These are not the only tasks that could be solved. These are just 10 tiny examples.

2 : Are the Clojure programs faster? Approximately.

Each table row shows, for one named benchmark, how much the fastest Clojure program used compared to the fastest Java 7 program.

Clojure used what fraction? used how many times more?
Benchmark	Time	Memory	Code
n-body †	2×	5×	2×
binary-trees	2×	±	¹/₂
mandelbrot	3×	2×	±
fasta †	3×	5×	±
k-nucleotide	3×	2×	±
regex-dna	4×	±	±
spectral-norm	4×	5×	±
fannkuch-redux	5×	5×	±
reverse-complement	5×	2×	¹/₂
pidigits	6×	2×	¹/₃
fasta-redux †	9×	6×	±

Clojure used what fraction? used how many times more?
Time-used	\|-	\|---	25%	median	75%	---\|	-\|
(Elapsed secs)	2×	2×	3×	4×	5×	8×	9×

† possible mismatch - one-core program compared to multi-core program.

± read the measurements and then read the program source code.

3 : Are the Clojure programs faster? Measurements.

These are not the only tasks that could be solved. These are just 10 tiny examples. These are not the only compilers and interpreters. These are not the only programs that could be written.

For each named benchmark, measurements of the fastest Clojure program are shown for comparison against measurements of the fastest Java 7 program.

Program Source Code	CPU secs	Elapsed secs	Memory KB	Code B	≈ CPU Load
n-body
Clojure	46.80	36.83	67,092	2162	10% 12% 10% 95% †
Java 7	24.41	24.39	13,976	1424	0% 0% 0% 100% †
binary-trees
Clojure	32.52	19.05	553,112	657	53% 71% 27% 20%
Java 7	21.35	9.21	525,420	1007	50% 70% 48% 65%
mandelbrot
Clojure	67.37	18.42	106,624	1069	95% 94% 90% 88%
Java 7	27.14	6.90	67,612	796	98% 98% 99% 99%
fasta
Clojure	22.42	14.17	81,136	1839	23% 88% 22% 27% †
Java 7	5.07	4.99	14,976	1507	2% 0% 100% 1% †
k-nucleotide
Clojure	118.43	39.22	1,015,780	1737	82% 66% 74% 82%
Java 7	44.83	12.93	494,264	1602	84% 81% 85% 99%
regex-dna
Clojure	65.79	34.29	998,912	710	35% 36% 46% 76%
Java 7	27.09	9.43	708,060	929	65% 83% 78% 63%
spectral-norm
Clojure	54.52	15.66	70,732	808	88% 87% 89% 86%
Java 7	16.39	4.21	14,740	950	97% 97% 98% 99%
fannkuch-redux
Clojure	277.79	81.98	70,084	1088	85% 85% 85% 85%
Java 7	67.91	17.17	14,460	1282	98% 99% 100% 100%
reverse-complement
Clojure	14.95	7.72	482,228	1044	32% 81% 40% 43%
Java 7	2.93	1.52	294,784	1661	32% 59% 58% 47%
pidigits
Clojure	46.39	32.36	81,584	571	19% 19% 36% 71%
Java 7	11.75	5.12	46,488	1826	70% 67% 56% 39%
fasta-redux
Clojure	25.65	16.03	82,180	1503	40% 77% 26% 19% †
Java 7	1.90	1.85	14,500	1443	1% 2% 3% 100% †